Question

refractive index of water is 4/3 and that of the glass is 3/2 with regard to air. what is the refractive index of glass with respect to the water? what is the power of concave lens of focal length 200cm.

Answer 1

Answer:

n of water :1.33

n of glass:1.5

Explanation:

refractive index of glass w.r.t water is

ng÷nw=1.127

We, know that power is 1÷f=1÷200=0.005

Answer 2

Solution

refractive index of glass with respect to the water.....

$\frac{refractive \: index \: of \: glass \: w.r.t. \: air}{refractive \: index \: of \: water\: w.r.t. \: air} \\ = \frac{ \frac{3}{2} }{ \frac{4}{3} } \\ = \frac{3}{2} \times \frac{3}{4} \\ = \frac{9}{8} \\ = 1.125$

and

the power of concave lens of focal length 200cm=2m is .

=1/2

=0.5dpt